v15 · 24 framework · 57 scenarios
See where and why
it breaks
Draw your architecture and run traffic. Watch in real time how CPU · pools · queues · caches · brokers fill up and where they break.
Interview-grade system design scenarios, verified against public benchmarks (~3.1% error).
24
Framework
17
Workload kinds
3.1%
Benchmark error
Why serversim?
🎯
Domain Accuracy
Average error ~3.1% against public benchmark references. Four-layer model covering CPU · memory · disk · NIC · concurrency · pools.
🎓
Interview + Teaching
Classic interview system design patterns (URL shortener / chat / video streaming / mobility / social feed). Defuse the "just add more servers" trap.
🛠
Real Operational Knobs
threads.max / pool size / accept-count / heap / GC / replica lag — the knobs you actually turn in production.
Beta — invited testers only
Currently only pre-approved beta testers can use the simulator. We will announce the public launch.
Open Simulator →